aboignard



. (No Model.) 2 ShetsSheet 1.

M. GROIGNARD.

VALVE.

No. 605,711., Patented June 14, 1898.

I A, P. N

W'ZMSJb-S rwvewzor (No Model.) 2 Sheets-Sheet 2.

' M. GROIGNARD.

VALVE.

Patented June 14', 1898.

.v NITED ST PATENT OFFICE.

MARIUS GROIGNARD, OF MARSEILLES, FRANCE.

VALVE.

SPECIFICATION forming part of Letters Patent No. 605,711, dated June 14, 1898. Application filed April 17, 1896. I Renewed January 13, 1898; $eria1No. 666,578. (No model.)

To all whom it mag concern:

Be it known that I, MARIUS GRQIGNARD, a citizen of the French Republic, residing at Marseilles, France, have invented certain new and useful Improvements in Valves; and I do hereby declare the following to be afull, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The present invention relates to a valve for steam or other fluid under pressure adapted to close rapidly and automatically in case of rupture of the conduit and adapted to retain the normal open position by the pressure of the fluid when once the valve has been removed from its seat.

Figure l of the accompanying drawings is a vertical cross-section through myimproved valve in normal closed position. Fig. 2 is a vertical cross-section showing the parts of the valve in open position. Fig. 3 is a vertical cross-section through the valve, showing the parts in the position when in case of accidentthe valve is closed automatically.

The flanged opening to be connected to the conduit or pipe coming from the boiler or other source furnishing fluid under pressure is designated by the letter A, and. B on the opposite sideis the exit of the steam or other fluid.

C is a valve-plate forced from below against its seat.

P is a hollow piston-movable in an open cylinder P, forming part of the body P which the valve operates in the well-known manner a screw-spindle D, which is provided at its lower end with a headD, screwed upon or bottom plate of the piston P, forcing the same down simultaneously with the piston 10 and the valve-plate C, so that the steam or other fluid can pass from A to B, as shown by the arrows. Then the hand-wheel is turned backward until the head D of the spindle is about half-way up in the hollow piston P. This constitutes the normal open position, as shown in Fig. 2 The pressure of the fluid will prevail in all parts of the valve, and as the surface of the piston P is greater than the surface of the piston 19 the pressure will keep the parts in the open position, Fig. 2. If breakage occurs in the conduit branching off from the opening 13, the pressure under the partition B will be higher than the pressure above the same, and acting on the lower surface of the piston 19 it will start to lift the same, with the rod Q and the valve-plate C, so that the latter moves against its seat and intercepts the flow of the fluid. The parts will then take the position shown in Fig. 3.

Having thus described my invention, what I claim as new, and desire to secure by Letters MARIUS oRoIeNARD.

Witnesses:

M. GAN, A. SEMEROIE. 

